Equity - Summary of Dividends Paid and Stock Repurchases and Retirements (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Dividends
Per share (in dollars per share)	$ 0.20	$ 0.19		$ 0.60	$ 0.57
Amount	$ 66.2	$ 64.7		$ 197.9	$ 196.4
Repurchased under the 2018 Stock Repurchase Program
Amount	$ 100.4	111.1		345.7	$ 354.9
Forward contract under ASR		$ 60.0	$ 60.0	$ 40.0
Stock Repurchase Program 2018
Repurchased under the 2018 Stock Repurchase Program
Shares (in shares)	4.2	5.1		14.5	13.7
Average price (in usd per share)	$ 23.93	$ 24.90		$ 23.86	$ 25.45
Amount	$ 100.0	$ 50.0		$ 300.0	$ 350.0